The window api makes me think one could pretty easily create an i3 like window manager. But my past experience with OSX window managers like amethyst has been subpar. Often the sizing/positioning is taken more as a “suggestion” by the window than a command. I also found eventually windows would get into a bad state. Has window management on OSX improved in the past couple years? On Linux with X11, window managers truly have control and thus provide a more reliable experience.
I have had a pretty stable setup using yabai[0] for my wm and skhd[1] for my hotkey daemon. Both are by the same dev and I have nothing but good things to say about them. Occasionally windows will get in a wonky state, but I have a hot key to reset them. It is usually stable for a week+
[0]https://github.com/koekeishiya/yabai [1]https://github.com/koekeishiya/skhd